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 DeepSeek-R1DeepSeek |  GPT-5.5OpenAI | DeepSeek-V4-Pro DeepSeek |  Claude 4.5 HaikuAnthropic | |
|---|---|---|---|---|
| Vendor | DeepSeek | OpenAI | DeepSeek | Anthropic |
| Family | DeepSeek | GPT | DeepSeek | Claude |
| Release date | 2025-01-20 | 2026-04-23 | 2026-04-22 | 2025-10-01 |
| Context window | 128,000 tokens | 400,000 tokens | 1,000,000 tokens | 200,000 tokens |
| Parameters | 671B | — | 1.6T (49B active) | — |
| Modality | text | text, vision, audio | text | text, vision |
| License | MIT | proprietary | MIT | proprietary |
| Source | open weights | proprietary | open weights | proprietary |
| Description | Reasoning-focused open-weight model. | OpenAI's smartest and most intuitive model — successor to GPT-5, with major coding, research, and document workflow gains. GPT-5.5 Pro variant also available for heavier reasoning. | DeepSeek's flagship open-weight MoE. 1.6T parameters with 49B activated, 1M-token context, and a hybrid attention scheme (CSA + HCA) that delivers long-context inference at ~27% of V3.2's FLOPs. | Fast, cost-effective Claude model. |
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